OK, maybe more than just sometimes.
But they are my primary e-mail provider. All of my many e-mail accounts filter there. For the last day or two, they’ve been kicking up errors randomly whenever I try to do pretty much anything: compose an e-mail, send an e-mail, read an e-mail, open a folder, etc. Seven times out of ten, it won’t work, whatever it is. Now, even mail.yahoo.com fails to resolve, with a “connection error, page not found” error.
For f%&# sake, Yahoo. Get your shit together.
Life Begins at 41...or maybe 43 
Ouch
And after many years – it is such a bugger trying to even think of changing!
I was also having problems with Yahoo, but it seems to be o.k. now. Nice to have other email accounts though.:)
I was never all that fond of Yahoo. Gmail seems to work pretty well, though.